no. 3
Floquet operators with singular spectrum. II
Annales de l'I.H.P. Physique théorique, Volume 50 (1989) no. 3, pp. 325-334.
follows Floquet operators with singular spectrum. I
followed-by Floquet operators with singular spectrum. III 
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     author = {Howland, James S.},
     title = {Floquet operators with singular spectrum. {II}},
     journal = {Annales de l'I.H.P. Physique th\'eorique},
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     number = {3},
     year = {1989},
     zbl = {0689.34023},
     mrnumber = {1017967},
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     url = {http://archive.numdam.org/item/AIHPA_1989__50_3_325_0/}
}
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Howland, James S. Floquet operators with singular spectrum. II. Annales de l'I.H.P. Physique théorique, Volume 50 (1989) no. 3, pp. 325-334. http://archive.numdam.org/item/AIHPA_1989__50_3_325_0/

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[3] J.S. Howland, Scattering Theory for Hamiltonians Periodic in Time, Indiana J. Math., Vol. 28, 1979, pp. 471-494. | MR | Zbl

[4] J.S. Howland, Floquet Operators with Singular Spectrum, I. Ann. Inst. H. Poincaré (to appear). | Numdam | Zbl